import { createEffect, createEvent, createStore, merge } from 'effector';
import nanoid from 'nanoid';
import { request, parseObject } from 'jsonrpc-lite';

const wsURL = `ws://localhost:${process.env.WS_PORT}`;
let socket;

const awaitingMap = new Map();

function cleanSocket() {
  socket.onopen = null;
  socket.onclose = null;
  socket.onerror = null;
  socket.onmessage = null;
}

const open = createEvent('open');
const closed = createEvent('closed');
const error = createEvent('error');

const onMessage = createEvent('message');

onMessage
  .map(({ data }) => JSON.parse(data))
  .watch(payload => {
    const {
      payload: { id, result },
      type
    } = parseObject(payload);

    const { resolve, reject } = awaitingMap.get(id);
    if (type === 'error') {
      reject(result);
    }
    awaitingMap.delete(id);
    resolve(result);
  });

export const fetch = createEffect('fetch', {
  handler({ method, params }) {
    const id = nanoid();
    socket.send(request(id, method, params));
    const promise = new Promise((resolve, reject) => {
      awaitingMap.set(id, { resolve, reject });
    });

    return promise;
  }
});

fetch.watch(payload => console.log(`Запрос`, payload));
fetch.done.watch(payload => console.log('Ответ на запрос', payload));
fetch.fail.watch(payload => console.log('Ошибка', payload));

export function disconnect() {
  console.warn('websocket connection is disconnect');
  socket.close();
}

export function connect() {
  try {
    console.info(`Try to connect on ${wsURL}`);
    socket = new WebSocket(wsURL);
  } catch (e) {
    throw new Error(e.message);
  }

  socket.onopen = event => open(event);
  socket.onclose = ({ wasClean, code, reason }) =>
    closed({ wasClean, code, reason });
  socket.onerror = err => error(err);
  socket.onmessage = msg => onMessage(msg);
}

open.watch(() => {
  console.info('connect ready');
});

closed.watch(({ code, reason }) => {
  console.warn(`[close] Connection is closed, code=${code} reason=${reason}`);
});

error.watch(err => {
  console.error(`[error] ${err.message}`);
});

merge([closed, error]).watch(() => cleanSocket());

const $status = createStore('closed')
  .on(open, () => 'open')
  .on(closed, () => 'closed')
  .on(error, () => 'error');

$status.watch(state => console.log(`websocket is ${state}`));